FINISHED CAREFUL SCRUTINY AND CLEANUP OF UPLOAD MODULE
I made extensive runs with the integrated logic analyzer (ILA), ensuring that the logic all behaved as I wanted. Based on the results, I made a few optimizations and changes to the design, until it looked as good as I wished.
I verified that it was correctly stepping through all 321 words of the sector, fetching the dummy 322 word which provided feedback on any sync or data word ECC errors encountered, and that it advanced properly through every sector, head, and cylinder to the end of the cartridge.
Using a log from the Putty terminal program, I captured the output and counted characters as well as lines to cross check that I received all the sectors and status lines.
POSSIBLE FUTURE VERIFICATION
One step I could take to further verify that all the addressing and RAM operation were correct would be to populate RAM with contents prior to the start of the upload, with each word having its cyl, head, sector and word number as its data value. That way I could examine the output captured by Putty and ensure that we are storing and reading RAM correctly.
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